La Marmotte Granfondo Alpes Training Plan

La Marmotte Granfondo Alpes is the oldest and most iconic mountain cyclosportive in the world — and for most cyclists who care about climbing, the bucket-list event above all others. Starting from Bourg-d'Oisans at the foot of Alpe d'Huez, it covers 174 kilometers and 5,180 meters of vertical gain across four of the most legendary climbs in Tour de France history: Col du Glandon, Col du Télégraphe, Col du Galibier, and the final ascent of Alpe d'Huez. Roughly 10% of starters abandon every year — more in bad weather or extreme heat. The Galibier peaks at 2,642 meters, where thin air and 9% gradients combine to destroy riders who ignored altitude in training. La Marmotte does not care who you were in training; it only responds to who you've prepared to be on race day.

Course Demands

La Marmotte's demands are stacked from the first pedal stroke: the Col du Glandon begins within 10 km and climbs 21 km at 6.9% average; the Télégraphe/Galibier combination that follows is effectively 30 km of climbing with a short valley break, culminating above 2,600 meters where the air is measurably thin. After the Galibier's long fast descent to Bourg, the final climb to Alpe d'Huez — 13.8 km at 8% average, with the opening two kilometers at 10–11% — is completed on legs that have already climbed 4,000+ meters. Mid-afternoon sun turns Alpe d'Huez into a furnace with temperatures regularly exceeding 30°C. A pacing mistake on the Glandon costs hours by the time riders reach Alpe d'Huez.

What This Plan Targets

• ✓High-volume aerobic endurance for 6.5–14 hour efforts on successive major climbs
• ✓Altitude-specific threshold climbing (Galibier above 2,000 m demands 5–10% power deductions)
• ✓Fat-oxidation efficiency — riding the long climbs at sub-threshold without glycogen depletion
• ✓Heat tolerance for mid-afternoon July Alpine conditions on Alpe d'Huez
• ✓Descending confidence and technical skills on long, steep Alpine descents

What You'll Get

• →Polarized base phase (Nov–Mar) building the aerobic engine before adding climbing-specific intensity
• →Pre-competition phase (Apr–Jun) with progressive threshold climbing and event simulations
• →Altitude pacing targets and heat acclimatization protocols for late-June racing
• →Race-day execution plan breaking the route into fueling and pacing segments

Training Approach

Long low-intensity rides progressing to 6–8 hours (building fat-oxidation); fasted training rides to conserve glycogen for race-day; high-altitude training camps (recommended in Alps or Tenerife in May/June); sustained threshold climbing blocks of 20–30 minutes at race pace.